Improvement in tubes ot steam-geneeatoes



No. 75,279. PATENTED MAR.10, '1868. P. M. KAFER. TUBE. FOR STEAMGENERATORS.

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Letters Patent No. 75,279, dated March 10, 1868.

IMPROVEMENT IN TUBES OF STEAM-GENERATORS.

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TO WHOM IT MAY CONCERN:

7 Be it known that I, PETER M. KAFER, of Trenton, New Jersey, haveinvented new and useful Improvements in Heating-Tubes for Bo'ilers; andI do hereby declare the following to be a full and'exact description ofthe same, reference being had to the drawings that accompany and form apart of these specifications, in which- Figure 1 isa vertical bisectionof one style of my improved tubes.

Figure 2, sectional 'view of one slightly different from the first. v I

Letter A, attube, closed at the bottom; letter B, another tube, open atboth ends, and of diameter much less than that,of A, .in which thislatter is placed; letter 0,:1. strip, of width equal to the spacebetween the inside 'of A. and the outside of B. This strip is arrangedspi'rn'lly between A and B, as the drawings illustrate.

In the tube A, at the end of tube B, I place aconieal or V-shaped piece,shown at e in fig. '1. This has a small opening inthe centre, so as toallow a. portion of the water to pass between it and the end of the tubeA.

This v-shaped piece serves to turn the current of the water up to beconducted by the spiral, 0, back through tube A.

The object of my invention is to make and produce, for the public, tubesfor fire and other engines that will sccure more uniformityof heat, andbe less liable to warp or suffer mis'plncement than those heretofore inuse.

Generally in e'nginesytho heat cannot be uniformly applied. One side ofthe tiibes will be more heated than the other, and thus be lessefi'eetunl. in its purpose, and, what is often worse, he warped orstrained from its normal position. Many engines from these causes callfor repairs almost at the very commencement of their use. The adoptionof my plan obvintes all this.

When heat is applied, and the water begins to ascend it is, by thespiral, 0, carried around and upwards, coming in contact with all sides,both of the tube A and the tube B. Now, however rapidly the fire iskindled and the heat accumulates, a disproportionate heating of anyparts will not take place.

I am aware that oblique or spiral fins or projections have beenintroduced into vertical or inclined watertubes of stcamboilers for thepurpose of producing rotative motion in the contents thereof, and thattheguides or fins-soplaced have been made of varying pitch. These,therefore, I distinctly disclaim; but

What I claim as my invention, and desire to secure by Letters Patent,is-

l. The continuous spiral guide, of uniform pitch, forming a. continuouschannel in vertical or, inclined water-tubes of steam-boilers,substantially as set forth end described.

2. -The V-shaped piece e, substantially as described and for thepurposes set forth. I

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

- PETER M. KAFER. Witnessetz.

Gmnnss H. W. Humvee, Cannes Moan-sun.

